package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    DishMapper dishMapper;

    @Autowired
    DishFlavorMapper dishFlavorMapper;

    @Autowired
    CategoryMapper categoryMapper;

    @Autowired
    SetmealDishMapper setmealDishMapper;



    /**
     * 新增菜品和对应的口味
     * @param dto
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dto) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto, dish);

        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        // 获取insert语句返回的主键值
        Long id = dish.getId();

        // 向菜品口味表插入n条数据
        List<DishFlavor> flavors = dto.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(id);
            }
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    public PageResult<DishVO> pageQuery(DishPageQueryDTO dto) {
        PageHelper.startPage(dto.getPage(), dto.getPageSize());
        // 分页查询指定的菜品
        Page<DishVO> result = dishMapper.pageQuery(dto);
//        List<DishVO> dishVOS = new ArrayList<>();
//        for (Dish dish : result.getResult()) {
//            DishVO dishVO = new DishVO();
//            BeanUtils.copyProperties(dish, dishVO);
//
//            // 口味
////            List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(dish.getId());
////            dishVO.setFlavors(dishFlavors);
////            dishVOS.add(dishVO);
//
//            // 分类
//            Category category = categoryMapper.getById(dishVO.getCategoryId());
//            dishVO.setCategoryName(category.getName());
//            dishVOS.add(dishVO);
//        }


        PageResult<DishVO> dishPageResult = new PageResult<>(result.getTotal(), result.getResult());
        return dishPageResult;
    }

    @Override
    @Transactional
    public void delete(List<Long> ids) {
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);

            // 判断当前菜品是否能删除 —— 是否存在起售中的菜品
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        // 判断当前菜品是否能删除 —— 是否被套餐关联了？
        if (setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        for (Long id : ids) {
//            // 删除菜品表中的菜品数据
//            dishMapper.deleteById(id);
//
//            // 删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);

        // 封装VO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dto) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto, dish);

        // 向菜品表插入1条数据
        dishMapper.update(dish);

        // 获取insert语句返回的主键值
        Long dishId = dish.getId();

        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishId);

        // 向菜品口味表插入n条数据
        List<DishFlavor> flavors = dto.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);
            }
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public void enableOrDisable(Long id, Integer status) {
        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);

        dishMapper.update(dish);

    }

    @Override
    public List<DishVO> getByCategoryId(Long categoryId) {
        List<DishVO> dishes = dishMapper.getByCategoryId(categoryId);
        return dishes;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
